Monthly climate guide
Montreal weather in August
Expect warm weather in Montreal in August: afternoons reach about 26°C (79°F), while nights drop to around 16°C (61°F). Around 100 mm of rain falls over the month (wet), and skies are often cloudy. Daytime highs are about the same as July and 4°C warmer than September.
What stands out in August
- Montreal is usually about 3°C warmer than Mont-Tremblant, 110 km away, in August.
- Temperatures are falling — expect highs around 4°C lower by September.
- August is Montreal's second warmest month.
- It's humid — around 73% — so the heat feels heavier.
Avg high
26°C
79°F
Avg low
16°C
61°F
Rainfall
100 mm
wet
Humidity
73%
relative
Sky
56%
cloud · often cloudy
Montreal weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | -6°C / 21°F | -17°C / 2°F | 72 mm | 92% | 69% |
| February | -4°C / 24°F | -15°C / 5°F | 68 mm | 90% | 69% |
| March | 1°C / 34°F | -8°C / 17°F | 73 mm | 86% | 65% |
| April | 10°C / 49°F | 0°C / 31°F | 97 mm | 80% | 68% |
| May | 19°C / 65°F | 8°C / 46°F | 91 mm | 79% | 66% |
| June | 23°C / 73°F | 13°C / 56°F | 105 mm | 78% | 61% |
| July | 27°C / 81°F | 17°C / 63°F | 84 mm | 74% | 55% |
| August | 26°C / 79°F | 16°C / 61°F | 100 mm | 73% | 56% |
| September | 22°C / 72°F | 12°C / 53°F | 84 mm | 75% | 54% |
| October | 14°C / 58°F | 5°C / 41°F | 108 mm | 80% | 69% |
| November | 5°C / 41°F | -3°C / 27°F | 67 mm | 84% | 72% |
| December | -2°C / 28°F | -10°C / 13°F | 91 mm | 90% | 77% |
What to pack for August
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is August a good time to visit Montreal?
Compare the months in the chart above to find your ideal window.
Best time to visit Montreal →Other Canada cities in August
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Montreal weather in August. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/canada/montreal/august
<a href="https://weathercompare.eu/weather/canada/montreal/august">Montreal weather in August</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/canada/montreal" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Montreal weather in August"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/canada/montreal/august">Montreal weather in August</a> – WeatherCompare</p>
Montreal in August: quick answers
Is August a good time to visit Montreal?
August is one of the wetter months in Montreal, with about 100 mm of rain. You can still go: pack a rain jacket and keep plans flexible.
How warm is Montreal in August?
Average highs are about 26°C (79°F) and average lows about 16°C (61°F), based on 10 years of daily data.
Does it rain a lot in Montreal in August?
Montreal typically gets around 100 mm of rain in August — wet.
Figures are long-term averages for the area around Montreal (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.